It has been confirmed regarding the percentage used in Lucozade & Ribena. There is only enough in it to preserve the taste to last longer. It would take over 2 hundred regular size bottles to gather enough alcohol to have the alcohol effect. This amount is litterally impossible to drink.

Therefore, it is permissible to drink these products, however, the best option is to prefer Taqwa where Lucozade and Ribena is avoided.

And Allah knows best.